S
M
T
W
T
F
S
26
58°
47°
27
71°
38°
28
63°
44°
29
62°
55°
30
70°
43°
1
70°
37°
2
63°
48°
3
65°
35°
4
78°
43°
5
85°
53°
6
73°
58°
7
63°
44°
8
74°
38°
9
78°
52°
10
85°
45°
11
61°
43°
12
74°
37°
13
76°
53°
14
64°
47°
15
74°
45°
16
86°
45°
17
90°
58°
18
96°
59°
19
97°
62°
20
96°
62°
21
70°
55°
22
59°
52°
23
58°
51°
24
67°
53°
25
77°
64°
26
76°
66°
27
79°
64°
28
82°
51°
29
81°
54°
30
76°
49°
31
74°
52°
1
77°
50°
2
74°
49°
3
76°
51°
4
78°
57°
5
82°
59°
6
79°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Boston
Boston's May 2026 forecast shows daily high temperatures ranging from 74° to 82°, with overnight lows between 49° and 64°. The average high for May is 78° with an average low of 54°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Boston. See also: June | July | August.
